<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- end -->

        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert
                title="添加商品信息"
                type="info"
                center
                show-icon
                :closable = 'false'>
            </el-alert>
            <!-- end -->

            <!-- 步骤条 -->
            <el-steps :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
            </el-steps>
            <!-- end -->

            <!-- tab 标签 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px"
            label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight" type="number">
                            <el-input v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="catlist"
                                :props="{ expandTrigger: 'hover',
                                label: 'cat_name',
                                value: 'cat_id',
                                children: 'children' }"
                                @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i">
                                </el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                                <!-- 图片要上传到的APi地址 -->
                        <el-upload
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture"
                        :headers="headerObj"
                        :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce">
                        </quill-editor>
                        <!-- 添加商品按钮 -->
                        <el-button type="primary" @click="add">添加商品</el-button>
                    </el-tab-pane>
                    <el-tab-pane name="5">完成</el-tab-pane>
                </el-tabs>
            </el-form>
            <!-- end -->
        </el-card>
        <!-- end -->

        <!-- 图片预览对话框 -->
        <el-dialog
        title="预览"
        :visible.sync="picDialogVisible"
        width="50%">
        <img :src="previewPath" class="previewImg">
        </el-dialog>

        <!-- end -->
    </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
      // 步骤当前索引
      activeIndex: '0',
      //   添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        pics: [],
        // 商品详情描述
        goods_introduce: '',
        attrs: []
      },
      // 添加商品的验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      //   商品分类列表
      catlist: [],
      //   动态参数列表数组
      manyTableData: [],
      //   静态属性列表数组
      onlyTableData: [],
      // upload url
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      //   预览图片地址
      previewPath: '',
      //   图片预览对话框显隐
      picDialogVisible: false

    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //   获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败！')
      this.catlist = res.data
    },
    // 级联选择器变化触发
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.$message.error('只能选择三级分类！')
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm
        .goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    async tabClicked() {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) return this.$message.error('数据获取失败！')
        res.data.forEach(item => { item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ') })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })

        if (res.meta.status !== 200) return this.$message.error('获取静态属性失败！')
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.picDialogVisible = true
    },
    // 处理图片删除操作
    handleRemove(file) {
      const filePath = file.response.data.tmp_path
      const fileIndex = this.addForm.pics.findIndex(item => item.pic === filePath)
      this.addForm.pics.splice(fileIndex, 1)
    },
    // 上传图片成功就会触发
    handleSuccess(response) {
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单项目！')
        //  执行添加的业务逻辑
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // 发起请求添加商品
        // 商品的名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) return this.$message.error(res.meta.msg)
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length ===
           3) return this.addForm.goods_cat[2]
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0!important
}
.previewImg{
    width: 100%;
}

.el-button{
    margin-top: 15px;
}
</style>
